Building cement or plaster



106. UUMrual 1 IUNa,

COATING R PLASTIC I Patented Feb. 18, 1930 UNITED STATES dross ReierencePATENT OFFICE I CHARLES E. mus, OI BABYLON, NEW YORK BUILDING mm 03PLASTER mi mm.

" 1 there is pro uced colloidal alumina and silica (where combinedsilica is present) and sulphates which ma be soluble or insoluble, whichcolloidal umina and silica or both. when used in conjunction withalkaline earths yield excellent cement or plasters.

For the sake of convenience, a material which is developed in theprocess is called Krauscake.

Application fled Inne 1a, 1925, Serial no. $5,104. V

will appear from the tables below) to form a slurry. This is an exampleof what I have called Slurry A. v

To this Slurry A may then be added suitable alkaline earths, the mixturethen forming Slurry B and the resulting colloidal content bein attained.Thus according to Formula 0. 1 of the Slurry A table hereinafter, noalkaline earth is added to this slurry. When, however, this slurry hashad added to it an alkaline earth, as for instance calcium h droxide asshown by Slurry B Formula 0. 1 of the following tables, the colloidalcontent of the alumina as referred to above is Krauscake is a product inwhich the base obtained. According to Formula No. 2 of the Slurry Atable, alkaline earth, namely is an aluminous earth or mineral matter,such as clay, kaolin, diaspore, cyanite, bentonite, feldspar, bauxite,etc. (materials containing 12% or more of alumina) together with other vgo substances necessar to give the desired results. There may e alsosuitably added to the mixture, to produce certain desired resultsalunite, high alumina slag, blast furnaceslag, cryolite, etc. ,=asindicated by the hereinafter tables.

The process may be illustrated as follows:

high calcium limestone, is added in the Slurry A and further alkalineearths may be added according to the various formulae in the Slurry Btable, resulting in'the desired colloidal content of the alumina, andany originally combined silica which may have been present with theclay. The essential thing is that the clay or other equivalent aluminousmaterial, roasted as described and digested with sulphuric acid, shallbe treated with The ggmnmsmi? as for instance, cla alkaline earth eitherin the Slurry A or when Rich is roaste at a tempera ur'e' below that wwould drive ofi all the combined water, allow- 80 ing 20% or less ofsuch water to remain, and upon the addition of alkaline earths digestedwith sul huric acid and water and after the ingredients 5 ave reactedEither water is added to form a slurry. The addition of alka- 85 lineearths to material containing the alumina causes oidal or finel dividedto 1 be forme e ca assumes a cdlloidal form upon separation from thealumina so that the originally combined silica, as well as the aluminaare obtained in the colloidal state. The alkaline earths may be added tothe roasted clay, digested with sulphuric acid in the slurry referred toor this slurry may formed without the addition of alkaline 1 earths andthealkaline earths added later.

In ca out the pro therefore I may digest e clay or like material withsulphuric acid as described in the presence of water which produces thematerial known as Krauscake and then suficient water added (as theSlurry B is formed. When alkaline material is added in the Slurry A, ahighly activated calciu'm sulphate is produced which I believe to be ofadvantage in some cases, but it is not of great importance whether theurualkaline earth is digested with the materials in forming theKrauscake or is added when the Slurry B is formed.

Of course external heat may be applied to hasten the reactions.

As -will ap ar from the tables hereinafter,

alkaline eart or materials containing alkaline earths, suitable for usein the above process include dolomitic limestone, high calciumlimestone, calcium 5 droxide, ca cium be oxide, Portland cement marletc. Ami

substances as um e, cm high calcium slag, blast furnace slag and othersubstances may be used as indicated in the tables hereinafter.

to which are added various in edients as illustrated by the formula: intc Slurry B The slurry B (which consists of Slurry A v of calciumhydroxide ture the best results are'o tained by roasting.-

table hereinafter) may be roasted or more alkaline earths may be addedto the Slurry B, such roasting be according to the material desired, andin eit er case a product will be produced which, when mixed with water,will have good plasticity, set and strength.

Examples of Slurries A are as follows:

SLURBY A Part: byweight h g 8A 2 a 3 I! 2 3% g :35 l'mnnlaNo. E H. 3 3fig 8 as? A a o 5 s. EEE-E-EEEE E m B a: m 0 :11 n m a: El

1 100 m 100 4 2 132 no 100 so 480 130 no 100 I) Y 480 136 11) 100 m 480136 no 100 I) 48) in 120 100 s a0 mo 1. m m 100 20 430 8----...-------132 120 100 480 9 132 12) 100 2) 80 Examples of Slurries B are asfollows:

' SLU'mzYB Parts by n .2 a 3 41 E :1 :2 g g 8 "5, e E Es 2g i 2 8 s 3'22s e W -33 s i 5 5 a s5 a" s B r s a E a s a a 3" E a o o c a? an 2 a mmBlnrryB 1 100 mo mo 8lurry.B2 100 100 10o 8lurryB3 10o 1(1) 100 Blurryn4 100 100 mu 10o Blm'ryBfi I 100 10 6 100 BlurryBfi 100 100 10ogllurryB7 1CD 6 100 perature' of 250 F. to 450 F. gives a uick 1 flashset. As the temperature is raise the set is retarded. Where a highpercentage is resent in the mixat a temperature of 400 F. to 600 F.

When extreme plasticity is desired .suflicient calcium oxide maybe addedto lurry B to take u the free water, which reaction .caustic sodasolution, or similar alkali enerates cient chemical heat for partial"ehydration of the sulphates; this heat cement or plaster which clay sothat 20% or less of its combined water no cement or laster whichcomprises treatlng' aluminous :naterial with sulphuric acid to formaluminum sulphate and treating the reaction materials with alkalineearth to produce elatinous alumina. 1

2. process for oducing an improved cement or plaster roasted aluminousmaterial with sulphuric acid'to form aluminum sullphate and treating areaction materials with alkaline earth to 1310- duce gelatinous aluminaand adding alk earth thereto.

5. A process for producing an improved cement or plaster which comprisestreating If]: w 'ch comprises treating aluminous material with sul huricacid to the form aluminum sulphate an treating reaction materials withalkaline earth to duce gelatinous alumina and adding earth thereto androasting.

6. A process for cement or plaster w ch comprises treating roasted claywith sulphuric acid to form aluminum sul hatean treating the reactionmaterials wit calcium oxide to produce gelatinous alumina.

7. A process for producing an improved cement or plaster which comprisestreating a L-oducing an improved" roasted earth comprising aluminousmaterial and combined silica, treating the roasted material withsulphuric acid to form aluminum sulphate and the latter in colloidalform, and treating the reaction materials with alkaline earth tofproduce gelatinous alumina.

8. A process or producing an improved cement qr plaster which comprisestreating a roasted earth comprising aluminous matenal and combinedsilica, treating the roasted material with sulphuricv acid to formaluminum sulphate and silica, the latter in colloidal form, and treatinroduce gelatinous alumina and adding furt er alkahne earth 9. A processfor pi'oducing an improved cement or plaster w ch comprises I aluminousmaterial to reduce its combin water to 20% or less of its normalcombined water, treating such roasted aluminous material with sulphuricacid to form aluminum sul hate and treating the. reaction materials wialkaline alumina.

10. A process I producing improved comp r0 a for V the reactionmaterials with alkaline cart to earth to produce gelatinous 106.COMPOSITIONS,

COATING 0a PLASTIC specification June, 1925.

CHARLES E.KRAUS.

Cross Reference txaminer

